org.apache.flink.runtime.taskexecutor.slot

Interface TaskSlotTable<T extends TaskSlotPayload>

All Superinterfaces:

AutoCloseable, org.apache.flink.util.AutoCloseableAsync, TimeoutListener<AllocationID>

All Known Implementing Classes:

TaskSlotTableImpl

public interface TaskSlotTable<T extends TaskSlotPayload>
extends TimeoutListener<AllocationID>, org.apache.flink.util.AutoCloseableAsync

Container for multiple TaskSlot instances. Additionally, it maintains multiple indices for faster access to tasks and sets of allocated slots.

The task slot table automatically registers timeouts for allocated slots which cannot be assigned to a job manager.

Before the task slot table can be used, it must be started via the start(org.apache.flink.runtime.taskexecutor.slot.SlotActions, org.apache.flink.runtime.concurrent.ComponentMainThreadExecutor) method.

Method Summary

Modifier and Type	Method and Description
boolean	addTask(T task) Add the given task to the slot identified by the task's allocation id.
boolean	allocateSlot(int index, org.apache.flink.api.common.JobID jobId, AllocationID allocationId, Duration slotTimeout) Allocate the slot with the given index for the given job and allocation id.
boolean	allocateSlot(int index, org.apache.flink.api.common.JobID jobId, AllocationID allocationId, ResourceProfile resourceProfile, Duration slotTimeout) Allocate the slot with the given index for the given job and allocation id.
SlotReport	createSlotReport(ResourceID resourceId)
default int	freeSlot(AllocationID allocationId) Try to free the slot.
int	freeSlot(AllocationID allocationId, Throwable cause) Tries to free the slot.
Set<AllocationID>	getActiveTaskSlotAllocationIds() Returns the AllocationID of any active task listed in this TaskSlotTable.
Set<AllocationID>	getActiveTaskSlotAllocationIdsPerJob(org.apache.flink.api.common.JobID jobId) Returns the AllocationID of active TaskSlots attached to the job with the given JobID.
Iterator<TaskSlot<T>>	getAllocatedSlots(org.apache.flink.api.common.JobID jobId) Return an iterator of allocated slots for the given job id.
Set<AllocationID>	getAllocationIdsPerJob(org.apache.flink.api.common.JobID jobId) Returns the all AllocationID for the given job.
AllocationID	getCurrentAllocation(int index) Get the current allocation for the task slot with the given index.
org.apache.flink.api.common.JobID	getOwningJob(AllocationID allocationId) Returns the owning job of the TaskSlot identified by the given AllocationID.
T	getTask(ExecutionAttemptID executionAttemptID) Get the task for the given execution attempt id.
MemoryManager	getTaskMemoryManager(AllocationID allocationID) Get the memory manager of the slot allocated for the task.
Iterator<T>	getTasks(org.apache.flink.api.common.JobID jobId) Return an iterator over all tasks for a given job.
boolean	hasAllocatedSlots(org.apache.flink.api.common.JobID jobId) Check whether the job has allocated (not active) slots.
boolean	isAllocated(int index, org.apache.flink.api.common.JobID jobId, AllocationID allocationId) Check whether the slot for the given index is allocated for the given job and allocation id.
boolean	isSlotFree(int index) Check whether the task slot with the given index is free.
boolean	isValidTimeout(AllocationID allocationId, UUID ticket) Check whether the timeout with ticket is valid for the given allocation id.
boolean	markSlotActive(AllocationID allocationId) Marks the slot under the given allocation id as active.
boolean	markSlotInactive(AllocationID allocationId, Duration slotTimeout) Marks the slot under the given allocation id as inactive.
T	removeTask(ExecutionAttemptID executionAttemptID) Remove the task with the given execution attempt id from its task slot.
void	start(SlotActions initialSlotActions, org.apache.flink.runtime.concurrent.ComponentMainThreadExecutor mainThreadExecutor) Start the task slot table with the given slot actions.
boolean	tryMarkSlotActive(org.apache.flink.api.common.JobID jobId, AllocationID allocationId) Try to mark the specified slot as active if it has been allocated by the given job.

Methods inherited from interface org.apache.flink.runtime.taskexecutor.slot.TimeoutListener

notifyTimeout

Methods inherited from interface org.apache.flink.util.AutoCloseableAsync

close, closeAsync

Method Detail

start

void start(SlotActions initialSlotActions,
           org.apache.flink.runtime.concurrent.ComponentMainThreadExecutor mainThreadExecutor)

Start the task slot table with the given slot actions.

Parameters:

initialSlotActions - to use for slot actions

mainThreadExecutor - ComponentMainThreadExecutor to schedule internal calls to the main thread

getAllocationIdsPerJob

Set<AllocationID> getAllocationIdsPerJob(org.apache.flink.api.common.JobID jobId)

Returns the all AllocationID for the given job.

Parameters:

jobId - for which to return the set of AllocationID.

Returns:

Set of AllocationID for the given job

getActiveTaskSlotAllocationIds

Set<AllocationID> getActiveTaskSlotAllocationIds()

Returns the AllocationID of any active task listed in this TaskSlotTable.

Returns:

The AllocationID of any active task.

getActiveTaskSlotAllocationIdsPerJob

Set<AllocationID> getActiveTaskSlotAllocationIdsPerJob(org.apache.flink.api.common.JobID jobId)

Returns the AllocationID of active TaskSlots attached to the job with the given JobID.

Parameters:

jobId - The JobID of the job for which the AllocationIDs of the attached active TaskSlots shall be returned.

Returns:

A set of AllocationIDs that belong to active TaskSlots having the passed JobID.

createSlotReport

SlotReport createSlotReport(ResourceID resourceId)

allocateSlot

@VisibleForTesting
boolean allocateSlot(int index,
                                        org.apache.flink.api.common.JobID jobId,
                                        AllocationID allocationId,
                                        Duration slotTimeout)

Allocate the slot with the given index for the given job and allocation id. If negative index is given, a new auto increasing index will be generated. Returns true if the slot could be allocated. Otherwise it returns false.

Parameters:

index - of the task slot to allocate, use negative value for dynamic slot allocation

jobId - to allocate the task slot for

allocationId - identifying the allocation

slotTimeout - until the slot times out

Returns:

True if the task slot could be allocated; otherwise false

allocateSlot

boolean allocateSlot(int index,
                     org.apache.flink.api.common.JobID jobId,
                     AllocationID allocationId,
                     ResourceProfile resourceProfile,
                     Duration slotTimeout)

Allocate the slot with the given index for the given job and allocation id. If negative index is given, a new auto increasing index will be generated. Returns true if the slot could be allocated. Otherwise it returns false.

Parameters:

index - of the task slot to allocate, use negative value for dynamic slot allocation

jobId - to allocate the task slot for

allocationId - identifying the allocation

resourceProfile - of the requested slot, used only for dynamic slot allocation and will be ignored otherwise

slotTimeout - until the slot times out

Returns:

True if the task slot could be allocated; otherwise false

markSlotActive

boolean markSlotActive(AllocationID allocationId)
                throws SlotNotFoundException

Marks the slot under the given allocation id as active. If the slot could not be found, then a SlotNotFoundException is thrown.

Parameters:

allocationId - to identify the task slot to mark as active

Returns:

True if the slot could be marked active; otherwise false

Throws:

SlotNotFoundException - if the slot could not be found for the given allocation id

markSlotInactive

boolean markSlotInactive(AllocationID allocationId,
                         Duration slotTimeout)
                  throws SlotNotFoundException

Marks the slot under the given allocation id as inactive. If the slot could not be found, then a SlotNotFoundException is thrown.

Parameters:

allocationId - to identify the task slot to mark as inactive

slotTimeout - until the slot times out

Returns:

True if the slot could be marked inactive

Throws:

SlotNotFoundException - if the slot could not be found for the given allocation id

freeSlot

default int freeSlot(AllocationID allocationId)
              throws SlotNotFoundException

Try to free the slot. If the slot is empty it will set the state of the task slot to free and return its index. If the slot is not empty, then it will set the state of the task slot to releasing, fail all tasks and return -1.

Parameters:

allocationId - identifying the task slot to be freed

Returns:

Index of the freed slot if the slot could be freed; otherwise -1

Throws:

SlotNotFoundException - if there is not task slot for the given allocation id

freeSlot

int freeSlot(AllocationID allocationId,
             Throwable cause)
      throws SlotNotFoundException

Tries to free the slot. If the slot is empty it will set the state of the task slot to free and return its index. If the slot is not empty, then it will set the state of the task slot to releasing, fail all tasks and return -1.

Parameters:

allocationId - identifying the task slot to be freed

cause - to fail the tasks with if slot is not empty

Returns:

Index of the freed slot if the slot could be freed; otherwise -1

Throws:

SlotNotFoundException - if there is not task slot for the given allocation id

isValidTimeout

boolean isValidTimeout(AllocationID allocationId,
                       UUID ticket)

Check whether the timeout with ticket is valid for the given allocation id.

Parameters:

allocationId - to check against

ticket - of the timeout

Returns:

True if the timeout is valid; otherwise false

isAllocated

boolean isAllocated(int index,
                    org.apache.flink.api.common.JobID jobId,
                    AllocationID allocationId)

Check whether the slot for the given index is allocated for the given job and allocation id.

Parameters:

index - of the task slot

jobId - for which the task slot should be allocated

allocationId - which should match the task slot's allocation id

Returns:

True if the given task slot is allocated for the given job and allocation id

tryMarkSlotActive

boolean tryMarkSlotActive(org.apache.flink.api.common.JobID jobId,
                          AllocationID allocationId)

Try to mark the specified slot as active if it has been allocated by the given job.

Parameters:

jobId - of the allocated slot

allocationId - identifying the allocation

Returns:

True if the task slot could be marked active.

isSlotFree

boolean isSlotFree(int index)

Check whether the task slot with the given index is free.

Parameters:

index - of the task slot

Returns:

True if the task slot is free; otherwise false

hasAllocatedSlots

boolean hasAllocatedSlots(org.apache.flink.api.common.JobID jobId)

Check whether the job has allocated (not active) slots.

Parameters:

jobId - for which to check for allocated slots

Returns:

True if there are allocated slots for the given job id.

getAllocatedSlots

Iterator<TaskSlot<T>> getAllocatedSlots(org.apache.flink.api.common.JobID jobId)

Return an iterator of allocated slots for the given job id.

Parameters:

jobId - for which to return the allocated slots

Returns:

Iterator of allocated slots.

getOwningJob

@Nullable
org.apache.flink.api.common.JobID getOwningJob(AllocationID allocationId)

Returns the owning job of the TaskSlot identified by the given AllocationID.

Parameters:

allocationId - identifying the slot for which to retrieve the owning job

Returns:

Owning job of the specified TaskSlot or null if there is no slot for the given allocation id or if the slot has no owning job assigned

addTask

boolean addTask(T task)
         throws SlotNotFoundException,
                SlotNotActiveException

Add the given task to the slot identified by the task's allocation id.

Parameters:

task - to add to the task slot with the respective allocation id

Returns:

True if the task could be added to the task slot; otherwise false

Throws:

SlotNotFoundException - if there was no slot for the given allocation id

SlotNotActiveException - if there was no slot active for task's job and allocation id

removeTask

T removeTask(ExecutionAttemptID executionAttemptID)

Remove the task with the given execution attempt id from its task slot. If the owning task slot is in state releasing and empty after removing the task, the slot is freed via the slot actions.

Parameters:

executionAttemptID - identifying the task to remove

Returns:

The removed task if there is any for the given execution attempt id; otherwise null

getTask

T getTask(ExecutionAttemptID executionAttemptID)

Get the task for the given execution attempt id. If none could be found, then return null.

Parameters:

executionAttemptID - identifying the requested task

Returns:

The task for the given execution attempt id if it exist; otherwise null

getTasks

Iterator<T> getTasks(org.apache.flink.api.common.JobID jobId)

Return an iterator over all tasks for a given job.

Parameters:

jobId - identifying the job of the requested tasks

Returns:

Iterator over all task for a given job

getCurrentAllocation

AllocationID getCurrentAllocation(int index)

Get the current allocation for the task slot with the given index.

Parameters:

index - identifying the slot for which the allocation id shall be retrieved

Returns:

Allocation id of the specified slot if allocated; otherwise null

getTaskMemoryManager

MemoryManager getTaskMemoryManager(AllocationID allocationID)
                            throws SlotNotFoundException

Get the memory manager of the slot allocated for the task.

Parameters:

allocationID - allocation id of the slot allocated for the task

Returns:

the memory manager of the slot allocated for the task

Throws:

SlotNotFoundException